[go: up one dir, main page]

WO2019141647A1 - Procédé et appareil pour rapporter une quantité de données en vue d'une transmission de liaison directe dans un réseau sans fil - Google Patents

Procédé et appareil pour rapporter une quantité de données en vue d'une transmission de liaison directe dans un réseau sans fil Download PDF

Info

Publication number
WO2019141647A1
WO2019141647A1 PCT/EP2019/050862 EP2019050862W WO2019141647A1 WO 2019141647 A1 WO2019141647 A1 WO 2019141647A1 EP 2019050862 W EP2019050862 W EP 2019050862W WO 2019141647 A1 WO2019141647 A1 WO 2019141647A1
Authority
WO
WIPO (PCT)
Prior art keywords
station
access point
data
stations
status report
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2019/050862
Other languages
English (en)
Inventor
Pascal Viger
Julien Sevin
Stéphane Baron
Patrice Nezou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Europe Ltd
Canon Inc
Original Assignee
Canon Europe Ltd
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Europe Ltd, Canon Inc filed Critical Canon Europe Ltd
Priority to US16/961,897 priority Critical patent/US20200374907A1/en
Publication of WO2019141647A1 publication Critical patent/WO2019141647A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates generally to communication networks and more specifically to wireless communication methods in wireless network comprising a plurality of stations, one of these stations playing the role of an access point, the other stations being connected to the access point, and corresponding devices.
  • the invention finds application in wireless communication networks, in particular to the access of an 802.11ax composite channel and of OFDMA Resource Units forming for instance an 802.11 ax composite channel for Uplink communication to the access point.
  • One application of the method regards wireless data communication over a wireless communication network using Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), the network being accessible by a plurality of station devices.
  • CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
  • a wireless network is composed of communicating stations. Typically, one of these stations plays the role of an access point. This access point station gives access to a more global network. All other stations, the non access point stations, are connected to the access point station. Using their connection to the access point station, the non access point stations have access to the global network. They also can communicate with other non access point station through the access point station. Some protocols have recently being introduced to also allow direct communication between non access point stations.
  • the word“station” refers to any kind of stations. We will use the wording“access point station”, or in short“access point”, to refer to the station playing the role of access point and the wording“non access point station” to refer to the other stations not playing this role.
  • the IEEE 802.1 1 MAC standard defines a way wireless local area networks (WLANs) must work at the physical and medium access control (MAC) level.
  • MAC medium access control
  • the 802.1 1 MAC (Medium Access Control) operating mode implements the well-known Distributed Coordination Function (DCF) which relies on a contention-based mechanism based on the so-called “Carrier Sense Multiple Access with Collision Avoidance” (CSMA/CA) technique.
  • DCF Distributed Coordination Function
  • the 802.1 1 medium access protocol standard or operating mode is mainly directed to the management of communication stations waiting for the wireless medium to become idle so as to try to access to the wireless medium.
  • the network operating mode defined by the IEEE 802.1 1 ac standard provides very high throughput (VHT) by, among other means, moving from the 2.4GHz band which is deemed to be highly susceptible to interference to the 5GHz band, thereby allowing for wider frequency contiguous channels of 80 MHz to be used, two of which may optionally be combined to get a 160 MHz composite channel as operating band of the wireless network.
  • VHT very high throughput
  • the 802.1 1 ac standard also provides control frames such as the Request-To-Send (RTS) and Clear-To-Send (CTS) frames, involved in a well- known RTS/CTS handshake, to allow reservation of composite channels of varying and predefined bandwidths of 20, 40 or 80 MHz, the composite channels being made of one or more channels that are contiguous within the operating band.
  • RTS Request-To-Send
  • CTS Clear-To-Send
  • the 160 MHz composite channel is possible by the combination of two 80 MHz composite channels within the 160 MHz operating band.
  • the control frames specify the channel width (bandwidth) for the targeted (or“requested”) composite channel.
  • a composite channel therefore consists of a primary channel on which a given station performs EDCA backoff procedure to access the medium, and of at least one secondary channel, of for example 20 MHz each.
  • the EDCA backoff procedure consists to randomly generate a backoff value which is a timer defining a waiting duration before the next attempt to emit on the channel when a collision has been detected.
  • the primary channel is used by the communication stations to sense whether or not the channel is idle, and the primary channel can be extended using the secondary channel or channels to form a composite channel. Given a tree breakdown of the operating band into elementary 20 MHz channels, some secondary channels are named tertiary or quaternary channels.
  • all the transmissions, and thus the possible composite channels include the primary channel. This is because the stations perform full Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) and Network Allocation Vector (NAV) tracking on the primary channel only.
  • the Network Allocation Vector defines a duration during which a station mustn’t access the channel.
  • the other channels are assigned as secondary channels, on which the 802.1 1 ac stations have only capability of CCA (clear channel assessment), i.e. detection of an availability state/status (idle or busy) of said secondary channel.
  • the 802.1 1 n and 802.1 1 ac standards provide the possibility to duplicate control frames (e.g. RTS/CTS or CTS-to-Self or ACK frames to acknowledge correct or erroneous reception of the sent data) on each 20MHz channel in an 802.1 1 a legacy format (called as“non-HT”) to establish a protection of the requested channels forming the whole composite channel, during the TXOP.
  • the TXOP is a bounded time interval in which stations are permitted to transfer a series of frames.
  • a TXOP is defined by a start time and a maximum duration.
  • any legacy 802.1 1 a station that uses any of the 20 MHz channel involved in the composite channel to be aware of on-going communications on the 20 MHz channel used.
  • the legacy station is prevented from initiating a new transmission until the end (as set on the NAV parameter) of the current composite channel TXOP granted to an 802.1 1 n/ac station.
  • 802.1 1 h a duplication of conventional 802.1 1 a or“non-HT” transmission is provided to allow the two identical 20 MHz non-HT control frames to be sent simultaneously on both the primary channel and the secondary channels forming the requested and used composite channel.
  • the“duplicated non-HT frame” or“duplicated non-HT control frame” or“duplicated control frame” means that the station device duplicates the conventional or“non-HT” transmission of a given control frame over secondary 20 MHz channels of the (40/80/160 MHz) operating band.
  • 802.11 ax task group As the successor of 802.11ac.
  • the primary goal of the 802.11 ax task group consists in seeking for an improvement in data speed to wireless communicating devices used in dense deployment scenarios.
  • Recent developments in the 802.11ax standard sought to optimize usage of the composite channel by multiple stations in a wireless network having an access point (AP). Indeed, typical contents have important amount of data, for instance related to high-definition audio-visual real-time and interactive content. Furthermore, it is well-known that the performance of the CSMA/CA protocol used in the IEEE 802.11 standard deteriorates rapidly as the number of stations and the amount of traffic increase, i.e. in dense WLAN scenarios.
  • multi-user (MU) transmission has been considered to allow multiple simultaneous transmissions to/from different users in both downlink (DL) and uplink (UL) directions from/to the access point.
  • DL downlink
  • UL uplink
  • multi-user transmissions can be used to mitigate the collision probability by allowing multiple stations to simultaneously transmit.
  • Each resource unit may be defined by a number of tones, the 20MHz channel containing up to 242 usable tones.
  • a tone corresponds to the basic subcarrier to be used for transmission.
  • OFDMA is a multi-user variation of OFDM which has emerged as a new key technology to improve efficiency in advanced infrastructure-based wireless networks.
  • FDMA Frequency Division Multiple Access
  • the multi-user feature of OFDMA allows the access point to assign different resource units to different stations in order to increase competition. This may help to reduce contention and collisions inside 802.1 1 networks.
  • the granularity of such OFDMA sub-channels is variable and may be finer than the original 20MFIz channel band.
  • a 2MFIz or 5MFIz sub-channel may be contemplated as a minimal width, therefore defining for instance 9 sub-channels or resource units within a single 20MFIz channel.
  • the 802.1 1 ax access point To support multi-user uplink, i.e. uplink transmission to the 802.1 1 ax access point (AP) during the granted TXOP, the 802.1 1 ax access point has to provide signalling information for the legacy stations (non-802.1 1 ax stations) to set their NAV in order to prevent them from accessing channels during the TXOP, and for the 802.1 1 ax stations to determine the allocation of the resource units.
  • a trigger frame is a control frame derived from a RTS frame with an additional payload to communicate additional signalling information like resource units allocation for example.
  • a resource unit can be reserved for a specific station, in which case the access point indicates, in the TF, the station to which the resource unit is reserved (the Association ID (AID) is provided to indicate which 802.1 1 ax station is allowed to use the resource unit).
  • Such resource unit is called a Scheduled resource unit.
  • the indicated station does not need to perform contention on accessing a scheduled resource unit reserved to it.
  • Another kind of resource units can be accessed by any stations using contention access.
  • Such resource unit is not allocated to a particular station. It means that the stations compete for accessing such resource units.
  • Such resource units are called Random resource units, and are indicated in the Trigger Frame with special station (STA) identification (e.g., value of Association ID (AID) is 0).
  • STA Trigger Frame with special station
  • the access point Since the access point performs contention on behalf of the STAs in this uplink OFDMA scheme, it is greatly preferable that the access point should be aware of which 802.1 1 ax stations hold uplink packets to transmit and what their related emission buffer sizes are.
  • the 802.1 1 e standard brought the quality of service mechanism. According to this mechanism the previously unique emission buffer has been split into four different emission buffers corresponding to four different access categories. Each access category corresponds to two different priorities, each emission buffer consequently holds data having two different priorities. Each of the eight priority level is identified by a traffic identifier (TID).
  • TID traffic identifier
  • the 802.1 1 e standard has also brought the mechanism of buffer status report (BSR). This mechanism provides a means for a station to report to the access point station the amount of data held in an emission buffer ready to be transmitted to the access point station.
  • the buffer status report mechanism is consequently adapted to report the amount of data held in the emission buffers corresponding to a given TID.
  • the access point is in charge of determining the width and duration of the uplink resource units for PPDU transmissions (PPDU length). All concerned 802.1 1 ax stations (those explicitly solicited by the access point through a scheduled resource unit allocation, or those determined through applying the OFDMA random access procedure) make the uplink transmission with the indicated duration inside the indicated resource units. If a 802.1 1 ax station’s packet length is shorter or longer than the indicated duration, this packet should be padded or fragmented to make all uplink OFDMA transmissions finish at the same time (note that the access point is free to offer different resource unit widths inside a same MU UL transmission opportunity).
  • the present invention has been devised to address one or more of the foregoing concerns.
  • a method of communication in a wireless network comprising an access point and stations, the method comprising by at least one emitting station having data to be directly transmitted to at least one destination station different from the access point:
  • said status report contains an identification element allowing the access point to reserve a wireless resource for the direct transmission between the emitting station and the destination station.
  • the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a "circuit", "module” or "system”.
  • the present invention may take the form of a computer program product embodied in any tangible medium of expression having computer usable program code embodied in the medium.
  • a tangible carrier medium may comprise a storage medium such as a floppy disk, a CD-ROM, a hard disk drive, a magnetic tape device or a solid state memory device and the like.
  • a transient carrier medium may include a signal such as an electrical signal, an electronic signal, an optical signal, an acoustic signal, a magnetic signal or an electromagnetic signal, e.g. a microwave or RF signal.
  • Figure 1 illustrates a typical wireless communication system in which embodiments of the invention may be implemented
  • FIGS. 2a, 2b and 2c illustrate the IEEE 802.11e EDCA involving access categories
  • Figure 3a, 3b and 3c illustrates an enhanced Buffer Status report according to 802.11 ax
  • FIG. 4 illustrates the frame structure of a traffic specification (TSPEC) as defined in IEEE 802.11 e.
  • TSPEC traffic specification
  • FIG. 5 illustrates the TS info field of a TSPEC as defined in IEE
  • Figure 6 shows a schematic representation a communication device or station in accordance with embodiments of the present invention
  • Figure 7 shows a block diagram schematically illustrating the architecture of a wireless communication device in accordance with embodiments of the present invention
  • Figure 8 illustrate a new format of report, suited for direct link transmissions and directed to an access point, according to embodiments of the invention
  • Figure 9 illustrates the TS info field of a TSPEC including if necessary a destination node identifier according to embodiments of the invention.
  • Figure 10 illustrates, using a flowchart, embodiments of the invention implemented at a non-AP station to generate data reports according to embodiments of the invention.
  • FIG. 1 illustrates a communication system in which several communication stations 101-107 exchange data frames over a radio transmission channel 100 of a wireless local area network (WLAN), under the management of a central station, or access point (AP) 110, also seen as a station of the network.
  • the radio transmission channel 100 is defined by an operating frequency band constituted by a single channel or a plurality of channels forming a composite channel.
  • Access to the shared radio medium to send data frames is based on the CSMA/CA technique, for sensing the carrier and avoiding collision by separating concurrent transmissions in space and time.
  • Carrier sensing in CSMA/CA is performed by both physical and virtual mechanisms.
  • Virtual carrier sensing is achieved by transmitting control frames to reserve the medium prior to transmission of data frames.
  • a source or transmitting station first attempts, through the physical mechanism, to sense a medium that has been idle for at least one DIFS (standing for DCF InterFrame Spacing) time period, before transmitting data frames.
  • DIFS standing for DCF InterFrame Spacing
  • the source station Flowever, if it is sensed that the shared radio medium is busy during the DIFS period, the source station continues to wait until the radio medium becomes idle.
  • the wireless communication system of Figure 1 comprises a physical access point station 110 configured to manage the WLAN BSS (Basic Service Set), i.e. a group of stations.
  • BSS Basic Service Set
  • Such BSS managed by an access point is called an infrastructure BSS.
  • BSS will be used as an equivalent of infrastructure BSS.
  • Direct Link Setup published in 802.1 1 e, allows direct station-to- station frame transfer within a basic service set. This is designed primarily for consumer use, where station to station transfer is more commonly used. However, DLS requires participation from the access point to facilitate the more efficient direct communication, and few, if any, access points have the necessary support for this.
  • TDLS Tunneled Direct Link Setup
  • Both DLS and TLDS require that stations be associated with the same access point.
  • Wi-Fi Direct peer to peer
  • Wi-Fi P2P peer to peer
  • Wi-Fi Direct may perform direct wireless communication with each other using the Wi-Fi Direct or TDLS technologies.
  • Communications inside a P2P group are concurrent to communications of the infrastructure network (those including the access point 110). That is, the stations involved at the same time in the P2P communications and BSS network have their transmission queue(s) served with data from both traffic modes.
  • Figures 2a, 2b and 2c illustrate the IEEE 802.1 1 e EDCA involving access categories, in order to improve the quality of service (QoS).
  • a communication station includes only one transmission queue/buffer. However, since a subsequent data frame cannot be transmitted until the transmission/retransmission of a preceding frame ends, the delay in transmitting/retransmitting the preceding frame prevents the communication from having QoS.
  • HCF Hybrid Coordination Function
  • EDCA enhances or extends functionality of the original access DCF method: EDCA has been designed for support of prioritized traffic similar to DiffServ (Differentiated Services), which is a protocol for specifying and controlling network traffic by class so that certain types of traffic get precedence.
  • DiffServ Differentiated Services
  • EDCA is the dominant channel access mechanism in WLANs because it features a distributed and easily deployed mechanism.
  • the EDCA medium access is still existing in 802.1 1 ax standard as the fundamental legacy protocol, that is to say it is in concurrency to the newly introduced Multi-User OFDMA of 802.1 1 ax.
  • Each AC has also its own set of channel access parameters or“queue backoff parameters”, and is associated with a priority value, thus defining traffic of higher or lower priority of MSDUs.
  • each queue backoff engine 211 is associated with a respective traffic queue for computing a respective queue backoff value to be used to contend access to at least one communication channel in order to transmit data stored in the respective traffic queue.
  • high priority traffic has a higher chance of being sent than low priority traffic: a station with high priority traffic waits a little less (low CW) before it sends its packet, on average, than a station with low priority traffic.
  • the four AC buffers 210 are shown in Figure 2a.
  • Buffers AC3 and AC2 are usually reserved for real-time applications (e.g., voice or video transmission). They have, respectively, the highest priority and the penultimate highest priority.
  • Buffers AC1 and AC0 are reserved for best effort and background traffic. They have, respectively, the penultimate lowest priority and the lowest priority.
  • Each data unit, MSDU, arriving at the MAC layer from an upper layer (e.g. Link layer) with a type of traffic (TID) priority is mapped into an AC according to mapping rules.
  • Figure 2b shows an example of mapping between eight priorities of traffic class (TID values between 0 - 7 are considered user priorities and these are identical to the IEEE 802.1 D priority tags) and the four ACs.
  • the data frame is then stored in the buffer corresponding to the mapped AC.
  • the MAC controller (reference 704 in Figure 7 below) of the transmitting station transmits a data frame from this traffic queue to the physical layer for transmission onto the wireless communication network.
  • a virtual collision handler 212 of the MAC controller operates a selection of the AC having the highest priority, as shown in Figure 2b, between the conflicting ACs, and gives up transmission of data frames from the ACs having lower priorities. Then, the virtual collision handler commands those ACs having lower priorities to start again a backoff operation using an increased CW value.
  • Figure 2c illustrates configurations of a MAC data frame and a QoS control field 200 included in the header of the IEEE 802.11 e MAC frame.
  • the MAC data frame also includes, among other fields, a Frame Control header 201 and a frame body 202.
  • the QoS control field 200 is made of two bytes, including the following information items:
  • TID traffic identifier
  • the traffic identifier takes the value of the transmission priority value (User Priority UP, value between 0 and 7 - see Figure 2b) corresponding to the data conveyed by the data frame or takes the value of a traffic stream identifier, TSID, value between 8 and 15, for other data streams;
  • User Priority UP value between 0 and 7 - see Figure 2b
  • TSID traffic stream identifier
  • Bit B4 is used by a non-AP station to differentiate the meaning of bits B8-B15 and is detailed here below;
  • Bits B5 and B6 define the ACK policy subfield which specifies the acknowledgment policy associated with the data frame. This subfield is used to determine how the data frame has to be acknowledged by the receiving station; normal ACK, no ACK or Block ACK.
  • bits B8-B15 represent the“queue size” subfield 203, to indicate the amount of buffered traffic for a given TID at the non-AP station sending this frame.
  • the queue size value is the total size, rounded up to the nearest multiple of 256 octets and expressed in units of 256 octets, of all packets buffered for the specified TID. The access point may use this information to determine the next TXOP duration it will grant to the station.
  • a queue size of 0 indicates the absence of any buffered traffic for that TID.
  • a queue size of 255 indicates an unspecified or unknown size for that TID 204.
  • bits B8- B15 represent the“TXOP Duration Requested” subfield. It indicates the duration, in units of 32 ps, that the sending station determines it needs for its next TXOP for the specified TID.
  • the“TXOP Duration Requested” provides an equivalent request as the“queue size”, as they both consider all packets buffered for the specified TID.
  • the 802.1 1 e MAC frame format, and more particularly the QoS Control field 200, have been kept for the up and comer standard versions as now described. The following description will be done with“queue size” format for the buffer status reports, as it is the largest usage. The invention remains applicable to the“TXOP Duration Requested” format.
  • 802.1 1 ac is targeting larger bandwidth transmission through multi-channel operations.
  • 802.1 1 ac channel allocation now supports composite channel bandwidth of 20 MHz, 40 MHz, 80 MHz or 160 MHz.
  • IEEE 802.1 1 ac introduces support of a restricted number of predefined subsets of 20MHz channels to form the sole predefined composite channel configurations that are available for reservation by any 802.1 1 ac station on the wireless network to transmit data.
  • a station is granted a TxOP through the enhanced distributed channel access (EDCA) mechanism on a“primary channel”. Indeed, for each composite channel having a bandwidth, 802.1 1 ac designates one channel as “primary” meaning that it is used for contending for access to the composite channel.
  • the primary 20MHz channel is common to all stations (STAs) belonging to the same basic set, i.e. managed by or registered to the same local Access Point (AP).
  • control frames e.g. RTS frame/CTS frame
  • the control frames are duplicated over each 20MHz channel of such composite channel.
  • the IEEE 802.11ac standard enables up to four, or even eight, 20 MHz channels to be bound. Because of the limited number of channels (19 in the 5 GHz band in Europe), channel saturation becomes problematic. Indeed, in densely populated areas, the 5 GHz band will surely tend to saturate even with a 20 or 40 MHz bandwidth usage per Wireless-LAN cell. Developments in the 802.11 ax standard seek to enhance efficiency and usage of the wireless channel for dense environments.
  • multi-user (MU) transmission features allowing multiple simultaneous transmissions to different users in both downlink and uplink directions.
  • MU multi-user
  • UL uplink
  • multi-user transmissions can be used to mitigate the collision probability by allowing multiple stations to simultaneously transmit.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • the 802.11ax access point has to provide signalling information for both legacy stations, namely non-802.11 ax stations, to set their NAV to prevent any transmission during the TXOP, and for 802.11ax stations to determine the Resource Units allocation.
  • legacy stations refers to non- 802.11 ax stations, meaning 802.11 stations of previous technologies that do not support OFDMA communications.
  • the AP provides transmission schedules to clients using a new control frame called a“trigger frame" (TF), which specifies which 802.11 ax stations can transmit during the specified time and which subsets of OFDMA sub-carriers they will use.
  • TF Trigger frame
  • the bandwidth or width of the targeted composite channel is signalled in the TF frame, meaning that the 20, 40, 80 or 160 MFIz value is added.
  • the TF frame is sent over the primary 20MFIz channel and duplicated, replicated, on each other 20MFIz channels forming the targeted composite channel. Thanks to the duplication of the trigger frame, it is expected that every nearby legacy station receiving the TF on its primary channel, then sets its NAV to the value specified in the TF frame. This prevents these legacy stations from accessing the channels of the targeted composite channel during the TXOP.
  • the trigger frame may define a plurality of OFDMA sub-carriers called resource units (RUs).
  • RUs resource units
  • the multi-user feature of OFDMA allows the access point to assign different resource units to different stations in order to increase competition. This may help to reduce contention and collisions inside 802.11 networks.
  • the trigger frame may designate“Scheduled resource units”, which may be reserved by the access point for certain stations in which case no contention for accessing such resource units is needed for these stations. Such resource units and their corresponding scheduled stations are indicated in the trigger frame. For instance, a station identifier, such as the Association ID (AID) assigned to each station upon registration, is added in association with each Scheduled resource unit in order to explicitly indicate the station that is allowed to use each Scheduled resource unit.
  • AID Association ID
  • Such transmission mode is concurrent to the classical EDCA, and the uplink data to be sent to the access point is picked from the EDCA queues 210.
  • the trigger frame may also designate“Random resource units”, in addition or in replacement of the“Scheduled resource units”, which can be randomly accessed by the stations of the network.
  • Random resource units designated or allocated by the access point in the TF may serve as basis for contention between stations willing to access the communication medium for sending data.
  • a collision occurs when two or more stations attempt to transmit at the same time over the same resource unit.
  • An AID equal to 0 may be used to identify random resource units.
  • the access point Since the receiver, the access point, performs contention on behalf of the non-AP stations in the uplink OFDMA, the access point should be aware of both which non-AP stations have uplink packets and what their buffer 210 sizes are. If non-AP stations without uplink packets are polled for uplink OFDMA transmission, then allocated uplink resources are wasted thus leading to wireless medium usage degradation.
  • a current version of IEEE 802.11 ax extends the usage of Queue size information 203 in a new QoS Control field, namely FIE Control (260), and possibly in replacement of QoS Control field for 802.11ax frames, in order to inform about the several queues 210, instead on only one, according to 802.11 e. This is now described now with reference to Figures 3a to 3c.
  • the A-Control subfield 260 aggregates several control fields, which is a sequence of one or more Control subfields 261.
  • the length of the A-Control subfield 260 is equal to 30 bits.
  • Each Control subfield 261 is composed of a Control ID 262 subfield indicating the type of information carried in the Control Information subfield 263 that follows. Padding bits are added to reach a 30-bit A- Control subfield if necessary.
  • Control Information subfield 263 When Control ID 262 is 1.
  • power data may be indicated in Control Information subfield 263 when Control ID 262 is 4.
  • Control subfield contains buffer status information (264). STA may report the buffer status for a preferred AC, or for all AC queues.
  • STA may report the buffer status for a preferred AC, or for all AC queues.
  • 802.11ax system is enabling scheduling/MU operation, the need for AP to obtain accurate and timely information regarding stations’ persistent traffic characteristics and QoS requirements is critical for APs to satisfy stations’ QoS requirements.
  • Figure 4 illustrates the frame structure of a traffic specification (TSPEC) as defined in IEEE 802.11 e, that is a good candidate that can be used for such purpose.
  • TSPEC traffic specification
  • the TSPEC element (400) contains a set of parameters/fields that define the characteristics and QoS expectations of a traffic flow for a given station. It allows a set of parameters more extensive than might be needed, or might be available, for any particular instance of parameterized QoS traffic. Unless indicated otherwise, fields that follow the TS Info field are set to 0 for any unspecified parameter values. STAs set the value of any parameters to unspecified if they have no information for setting that parameter.
  • TSPEC element contains a field referred to as“TS info” field (410) which contains the information to identify a traffic stream.
  • Field 410 is described with reference to Figure 5.
  • FIG. 5 illustrates the TS info field of a TSPEC as defined in IEEE 802.11 e. It contains a set of parameters/fields allowing to identify the stream.
  • TS info field 510 contains a subfield 511 referred to as traffic type, a subfield 512 referred to as TSID and a subfield 513 referred to as Direction.
  • Subfield 511 is a single bit and is set to 1 for a periodic traffic pattern (e.g., isochronous TS of MSDUs or A-MSDUs, with constant or variable sizes, that are originated at fixed rate) or set to 0 for an aperiodic, or unspecified, traffic pattern (e.g., asynchronous TS of low-duty cycles).
  • Subfield 512 is 4 bits in length and contains a value that is a TSID.
  • Subfield 513 specifies the direction of data carried by the traffic stream. It is 2 bits in length (identified by bit 5 and bit 6) with the following value:
  • bit 5 is equal to 0 and bit 6 is equal to 0, it means that the direction of the traffic stream is uplink (from a non-AP station to AP). If bit 5 is equal to 1 and bit 6 is equal to 0, it means that the direction of the traffic stream is downlink (from AP to a non-AP station). If bit 5 is equal to 0 and bit 6 is equal to 1 , it means that the direction of the traffic stream is direct link (from a non-AP station to another non-AP station). If bit 5 is equal to 1 and bit 6 is equal to 1 , it means that the direction of the traffic stream is bidirectional link (both downlink and uplink with the same parameters).
  • TS info field 510 contains a set of additional fields 514 including an Access Policy subfield (2 bits), an Aggregation subfield (1 bit), an APSD subfield (1 bit), a User Priority subfield (3 bits), a TS Info Ack Policy subfield (2 bits), a schedule subfield (1 bit). Moreover it contains a Reserved subfield 514 (7 bits).
  • the station includes the TSPEC in some action frames, like the Add Traffic Stream (ADDTS), to perform an admission request or closure of the characterized traffic.
  • ADDTS Add Traffic Stream
  • the access point Once the access point has obtained traffic specifications and/or buffer reports for a set of stations of its BSS, it can specifically poll them through scheduled resource unit allocation. This allocation is transmitted using a trigger frame for data transmission. Then, the stations with allocated resource units emits their buffered data inside their allocated resource unit. As the MU UL/DL OFDMA transmissions on all the resource units of the composite channel should be aligned in time, the station may provide padding payload in case of no more data can be sent inside the assigned resource unit. This may happen, for example, if no more data is buffered for transmission, or if the emitting station doesn’t want to fragment any remaining data frame.
  • the access point is able to manage the resource unit size according to the reported needs.
  • the access point may schedule the uplink resource unit(s) during the TXOP period to any of the stations having sent a report.
  • communications inside a P2P group are concurrent to communications of the infrastructure network, including the access point 110. That is, the stations involved at the same time in the P2P communications and BSS network have their transmission queue(s) served with data from both traffic modes.
  • the 802.1 1 classical usage for constructing/using such reports is no longer adapted to this transmission concurrency, as only the needs towards AP is reported inside the queue size information of their buffer reports or flow characteristic information delivered by the TSPEC.
  • the current format of the various reports of the art is not adapted for conveying information about P2P communications.
  • Important wireless resource allocation may be used twice, because relayed by the AP. In addition to a worse efficiency of the global system, energy for transmitting twice is consumed by the 802.1 1 ax station.
  • the 802.1 1 ax stations with P2P communications will still require an EDCA access for emitting its pending traffic, that shall grant by itself. This increase the contention onto the wireless medium.
  • the present invention seeks to improve the reservation of the wireless resources for multi-user transmission, particularly for direct-link. To do so, an aim of this invention is to provide more reliable data reports from an 802.1 1 ax station to the 802.1 1 ax access point, as a countermeasure to the raised issues.
  • An exemplary wireless network for the implementation of embodiments of the invention is an IEEE 802.1 1 ax network or one of its future versions.
  • the invention applies to any wireless network comprising stations, for instance an access point 110 and a plurality of stations 101 -107 exchanging data through a single-user, for example P2P communication between stations, and multi-user transmissions from non-AP stations to the access point.
  • the invention is especially suitable for data transmission in resource units of an IEEE 802.1 1 ax network and its future versions.
  • FIG. 6 schematically illustrates a communication device 600 of the radio network 100, configured to implement at least one embodiment of the present invention.
  • the communication device 600 may preferably be a device such as a micro-computer, a workstation or a light portable device.
  • the communication device 600 comprises a communication bus 613 to which there are preferably connected:
  • a central processing unit 611 such as a microprocessor
  • a random access memory 612 denoted RAM, for storing the executable code of methods according to embodiments of the invention as well as the registers adapted to record variables and parameters necessary for implementing methods according to embodiments of the invention;
  • At least one communication interface 602 connected to the radio communication network 100 over which digital data packets or frames or control frames are transmitted, for example a wireless communication network according to the 802.1 1 ax protocol.
  • the frames are written from a FIFO sending memory in RAM 612 to the network interface for transmission or are read from the network interface for reception and writing into a FIFO receiving memory in RAM 612 under the control of a software application running in the CPU 611.
  • the communication device 600 may also include the following components:
  • a data storage means 604 such as a hard disk, for storing computer programs for implementing methods according to one or more embodiments of the invention
  • the communication device 600 may be optionally connected to various peripherals, such as for example a digital camera 608, each being connected to an input/output card (not shown) so as to supply data to the communication device 600.
  • peripherals such as for example a digital camera 608, each being connected to an input/output card (not shown) so as to supply data to the communication device 600.
  • the communication bus provides communication and interoperability between the various elements included in the communication device 600 or connected to it.
  • the representation of the bus is not limiting and in particular the central processing unit is operable to communicate instructions to any element of the communication device 600 directly or by means of another element of the communication device 600.
  • the disk 606 may optionally be replaced by any information medium such as for example a compact disk (CD-ROM), rewritable or not, a ZIP disk, a USB key or a memory card and, in general terms, by an information storage means that can be read by a microcomputer or by a microprocessor, integrated or not into the apparatus, possibly removable and adapted to store one or more programs whose execution enables a method according to the invention to be implemented.
  • CD-ROM compact disk
  • ZIP disk a digital versatile disk
  • USB key or a memory card
  • an information storage means that can be read by a microcomputer or by a microprocessor, integrated or not into the apparatus, possibly removable and adapted to store one or more programs whose execution enables a method according to the invention to be implemented.
  • the executable code may optionally be stored either in read only memory 607, on the hard disk 604 or on a removable digital medium such as for example a disk 606 as described previously.
  • the executable code of the programs can be received by means of the communication network 603, via the interface 602, in order to be stored in one of the storage means of the communication device 600, such as the hard disk 604, before being executed.
  • the central processing unit 611 is preferably adapted to control and direct the execution of the instructions or portions of software code of the program or programs according to the invention, which instructions are stored in one of the aforementioned storage means.
  • the program or programs that are stored in a non-volatile memory for example on the hard disk 604 or in the read only memory 607, are transferred into the random access memory 612, which then contains the executable code of the program or programs, as well as registers for storing the variables and parameters necessary for implementing the invention.
  • the apparatus is a programmable apparatus which uses software to implement the invention.
  • the present invention may be implemented in hardware (for example, in the form of an Application Specific Integrated Circuit or ASIC).
  • FIG. 7 is a block diagram schematically illustrating the logical architecture of the communication device or station 600, either one of the stations 101 - 107 adapted to carry out, at least partially, the invention.
  • station 600 comprises a physical (PHY) layer block 703, a MAC layer block 702, and an application layer block 701.
  • PHY physical
  • MAC media access control
  • the PHY layer block 703 (e.g. a 802.1 1 standardized PHY layer) has the task of formatting, modulating on or demodulating from any 20 MHz channel or the composite channel, and thus sending or receiving frames over the radio medium used 100, such as 802.1 1 frames, for instance single-user frames, such as control frames (RTS/CTS/ACK/Trigger Frame), MAC data and management frames, based on a 20 MHz width to interact with legacy 802.1 1 stations, as well as MAC data frames of OFDMA type having smaller width than 20 MHz legacy (typically 2 or 5 MHz) to/from that radio medium.
  • 802.1 1 frames for instance single-user frames, such as control frames (RTS/CTS/ACK/Trigger Frame)
  • RTS/CTS/ACK/Trigger Frame control frames
  • MAC data and management frames based on a 20 MHz width to interact with legacy 802.1 1 stations, as well as MAC data frames of OFDMA type having smaller width than 20 MHz legacy (typically 2 or 5 MHz) to/
  • the MAC layer block or controller 702 preferably comprises a MAC 802.1 1 layer 704 implementing conventional 802.1 1 ax MAC operations, and one additional block 705 for carrying out, at least partially, embodiments of the invention.
  • the MAC layer block 702 may optionally be implemented in software, which software is loaded into RAM 612 and executed by CPU 611.
  • the additional block 705 is a report management module which drives the station in computing data information linked with direct link transmission needs to be provided for a requesting station, in particularly wherein the requesting station is the access point station that will use this reported information for allocating wireless resources (e.g. uplink OFDMA or SU access) to the station 600.
  • wireless resources e.g. uplink OFDMA or SU access
  • application layer block 701 runs an application that generates and receives data packets, for example data packets of a video stream.
  • Application layer block 701 represents all the stack layers above MAC layer according to ISO standardization.
  • Embodiments of the present invention are now illustrated through different flowcharts describing the behaviour at the stations’ side ( Figure 10) and through different report formats ( Figures 8 and 9). These embodiments supplement the 802.11 ax by specifying how the stations can report their status to the access point, either in the existing 802.11e frames or in newly 802.11 ax multi-user QoS Data/Null frames
  • an 802.11 ax station when considering the amount of data (to be) queued in direction to another non-AP station (i.e. for direct-link transmission), should indicate the destination station inside its status report.
  • this report includes transmissions from 802.11 ax stations to a peer non-AP 802.11ax station once a direct link transmission is established in between these at least two stations, and the peer non-AP 802.11 ax station is identified.
  • This is especially possible for DLS sessions, because this protocol envisages exchanging the stations’ AID.
  • AID Association Identifier
  • the direct link session is identified instead of the peer non-AP 802.11 ax station. This is especially possible for DLS sessions, because the AP is involved in the direct link establishment (DLS is allowed by AP).
  • the AID of a peer non-AP 802.11 ax destination station maybe unknown by the non-AP 802.11 ax station generating the report towards the AP.
  • the invention introduces the usage of a MAC address instead of a station identifier (AID), which is an address universally known and more especially shared with the AP (because the AP has allowed registration onto the BSS to the peer non-AP 802.11 ax destination station).
  • the AP would then retrieve the AID from the received MAC address, and use the AID for subsequent resource allocation.
  • Embodiments of the present invention are now illustrated through a new format of report for direct link traffics ( Figure 8).
  • This format 800 aims to be generic, in the sense it could handle various types of reports (e.g. buffer status, TSPEC, some reduced TSPEC format like PSR as shown in the figure, or any combination of those).
  • reports e.g. buffer status, TSPEC, some reduced TSPEC format like PSR as shown in the figure, or any combination of those.
  • the report 800 can be conveyed through the A-Control subfield 260. For instance, it may be indicated in Control Information subfield 263 when Control ID takes the value 7 (values 8 up to 15 remain reserved).
  • the first field 801 identifies the direct link session. Depending to the information present at the non-AP station generating the report, it may appear that the station does not know the AID of its peer destination station. In that case, the MAC address of peer destination station is specified: the field becomes 48- bit long (compared to 12-bit long for AID).
  • a bit precedes the field 801 in order to specify the duration of 801 (12 or 48 bits).
  • the AID can also convey a session identifier corresponding to the direct link session (e.g. identifier of the established direct link).
  • a session identifier corresponding to the direct link session (e.g. identifier of the established direct link). This can be envisaged when the AP has allowed the P2P session (like for DLS protocol) and has granted an identifier for this session.
  • the session identifier lies in an AID format of 12 bits. It is up to the AP to allocate distinct values compared to AID of stations.
  • Control ID field 802 offers support for the various formats of reports 803.
  • a Control ID value of 0 indicates that the reported information follows the BSR format 264; the whole report 800 then indicates at least a buffer size information representative of an amount of data buffered per TID for a given final destination station.
  • Control ID value of 1 indicates that the reported information follows the TSPEC format according to 802.1 1 e; the whole report 800 then indicates a traffic characteristic information representative of a direct link session directed to a given final destination station.
  • - a Control ID value of 2 indicates that the reported information follows the PSR format 804 (standing for Persistent Scheduling Request (PSR) information), that is used to convey essential traffic characteristics for a P2P traffic (that is to say a reduced format compared to the original TSPEC).
  • PSR Persistent Scheduling Request
  • report 800 is provided for the sake of illustration: any other combination of report information can be envisaged considering that an identifier corresponding to the P2P traffic shall be included (anyway the identifier refers to a station or an active direct link session).
  • the AID can be specified inside the TSPEC.
  • the generic format offers various possibilities of report (adding some new information with regards to the direct link), without increasing the values of control ID 262 of Aggregated Control format 200.
  • the non-AP station is thus offered various possibilities of reports. Of course, they are not exclusive: as example, a BSR report can follow a TSPEC report for the same established traffic, in a subsequent control 261 of the same MAC frame.
  • Figure 9 illustrates the TS info field of a TSPEC including if necessary a destination node identifier according to embodiments of the invention. It contains also a set of parameters/fields allowing to identify the stream. But the direct link streams are identified differently compared to TS info field described with reference to Figure 5.
  • the TS info field 910 contains also traffic type subfield (911 ), TSID subfield (912) and direction subfield (913) corresponding respectively to subfields 511 , 512 and 513 described with reference to Figure 5. According to the value of the subfield 513, the next fields 914 and 915 may be different from 514 and 515.
  • subfield 914 and subfield 915 corresponds to subfields 514 and 515. If the value of the subfield 513 is equal to 0 for bit 5 and 1 for bit 6, field 914 corresponds to association identifier (12 bits) of the destination address of the direct link session corresponding to the TSPEC (It means that the direct link session is already established). In such a case, field 915 is yet a Reserved subfield but its size is 6 bits (and not 7 bits as subfield 515).
  • the 802.1 1 ax station includes this new format of TSPEC in some action frames, like the Add Traffic Stream (ADDTS), to perform an indication request or closure of the characterized direct link traffic.
  • ADDTS Add Traffic Stream
  • Figure 10 illustrates, using a flowchart, embodiments of the invention implemented at a non-AP station to generate data reports according to embodiments of the invention.
  • Step 1000 consists in the reception of a direct link report request for generating a direct link report for a given direct link session involved a source station, referred to as DL SRC station, and a destination station, referred to as DL DST station.
  • DL SRC station a source station
  • DL DST station a destination station
  • the direct link report request may be generated at different instant. For instance, a direct link report request can be generated either the establishment of the corresponding direct link or not. If the direct link session is established, it means that the DL SRC station knows the association identifier (AID) of DL DST station exchanged during the establishment. If the direct link session is not established, DL SRC station doesn’t know AID of DL DST station. In such a case, DL SRC station identifies DL DST station by using the MAC address of the DL DST station.
  • AID association identifier
  • the direct link report request can be generated once, regularly or on-demand according to the 802.1 1 features implemented in the non- AP stations and AP.
  • the direct link report request is an internal request generated by the DL SRC station.
  • the request is an external message and has been generated and sent by the AP.
  • the direct link report request contains at least an AID of a source station, referred to REQ DL SRC station and a direct link session identifier.
  • An example of direct link session identifier may be the AID or the MAC address of the destination station (referred to REQ DL DST station).
  • step 1001 determines whether a corresponding direct link session is established between REQ DL SRC station (corresponding to DL SRC station) and REQ DL DST station. If yes, next step is 1002. If not, next step is 1003.
  • Step 1002 computes and generates a DL report based on AID format.
  • the AID of REQ DL DST is known.
  • DL report is described with reference to Figure 8.
  • field 801 is set to a direct link session identifier as for instance the AID of REQ DL DST.
  • Field 802 corresponds to the implementation type of DL report to be generated. If its value is equal to 00, the DL report contains the set of fields 264. If its value is equal to 2, the DL report contains the set of fields 264. If its value is equal to 1 , the DL report contains the set of fields 400.
  • field 801 is not present and field 802 is set to 1 . In such a case, the DL report contains the set of fields 910. In such a case, subfield 914 contains the AID of REQ DL DST.
  • Step 1003 computes and generates a DL report based on MAC address format.
  • the AID of REQ DL DST is not known, only the MAC address of the REQ DL DST is known.
  • DL report is described with reference to Figure 8.
  • Field 801 is set to the MAC address of REQ DL DST.
  • Field 802 corresponds to the implementation type of DL report to be generated. If its value is equal to 00, the DL report contains the set of fields 264. If its value is equal to 2, the DL report contains the set of fields 264. If its value is equal to 1 , the DL report contains the set of fields 400.
  • Step 1004 transmits the DL report generated either in step 1002 or in step 1003 to the AP for which the DL SRC station is associated.
  • the resource unit allocation is more efficient in dense scenarios like envisaged in 802.11 ax.
  • the allocation of wireless resources by the access point is performed in regards to the real needs of non-AP stations for their direct transmissions towards other non-AP stations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de communication dans un réseau sans fil comprenant un point d'accès et des stations. Dans le procédé, au moins une station émettrice dont des données doivent être transmises directement à au moins une station de destination différente du point d'accès : génère un rapport d'état devant être transmis au point d'accès, ledit rapport d'état indiquant une quantité de données d'au moins un tampon d'émission de la station émettrice, lesdites données étant adressées à l'une de ladite ou desdites stations de destination ; et transmet ledit rapport d'état au point d'accès, ledit rapport d'état contenant un élément d'identification permettant au point d'accès de réserver une ressource sans fil pour la transmission directe entre la station émettrice et la station de destination. En conséquence, le trafic programmé par une station est effectué avec une quantité précise de données pour la liaison directe.
PCT/EP2019/050862 2018-01-17 2019-01-15 Procédé et appareil pour rapporter une quantité de données en vue d'une transmission de liaison directe dans un réseau sans fil Ceased WO2019141647A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/961,897 US20200374907A1 (en) 2018-01-17 2019-01-15 Method and apparatus for reporting quantity of data for direct-link transmission in a wireless network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1800772.4 2018-01-17
GB1800772.4A GB2571250B (en) 2018-01-17 2018-01-17 Method and apparatus for reporting quantity of data for direct-link transmission in a wireless network

Publications (1)

Publication Number Publication Date
WO2019141647A1 true WO2019141647A1 (fr) 2019-07-25

Family

ID=61256164

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/050862 Ceased WO2019141647A1 (fr) 2018-01-17 2019-01-15 Procédé et appareil pour rapporter une quantité de données en vue d'une transmission de liaison directe dans un réseau sans fil

Country Status (3)

Country Link
US (1) US20200374907A1 (fr)
GB (1) GB2571250B (fr)
WO (1) WO2019141647A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024525942A (ja) * 2021-07-23 2024-07-12 華為技術有限公司 バッファ報告送信および受信方法ならびに装置

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109982380A (zh) * 2019-04-03 2019-07-05 成都中科微信息技术研究院有限公司 一种电力无线通信系统中的传输模式选择方法
US11665036B2 (en) * 2019-04-09 2023-05-30 Marvell Asia Pte Ltd Generation and transmission of physical layer data units in a composite communication channel in a vehicular communication network
US11381999B2 (en) * 2019-05-10 2022-07-05 Qualcomm Incorporated Multi-link aggregation link management
US11350431B2 (en) * 2019-06-21 2022-05-31 Qualcomm Incorporated Selective adjustment of packet durations
CN114097186B (zh) * 2020-06-01 2024-11-01 北京小米移动软件有限公司 确认ack反馈策略配置、ack反馈方法及装置、存储介质
GB2597271B (en) 2020-07-17 2023-06-14 Canon Kk Buffer status report signaling both buffered uplink traffic and buffered direct link traffic
CN116684315B (zh) * 2021-02-04 2024-06-18 华为技术有限公司 业务指示方法及装置
CN114126008B (zh) * 2021-10-26 2024-04-12 浙江大华技术股份有限公司 一种提升传输性能的方法、装置、系统和可读存储介质
WO2023245314A1 (fr) * 2022-06-20 2023-12-28 Huawei Technologies Co., Ltd. Dispositifs et procédés de coopération d'ap dans un réseau de communication sans fil
GB2623820B (en) * 2022-10-28 2025-03-12 Canon Kk Method, device, and computer program for reporting an amount of particular data to be transmitted in a wireless network
US20240380932A1 (en) * 2023-05-11 2024-11-14 Cisco Technology, Inc. Quality of service enhancements for video and extended reality applications over wireless networks

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013191353A1 (fr) * 2012-06-17 2013-12-27 엘지전자 주식회사 Procédé pour fournir un rapport d'état de tampon pour communication de dispositif à dispositif et appareil associé
WO2014022776A1 (fr) * 2012-08-03 2014-02-06 Intel Corporation Procédé et système pour permettre des communications de dispositif à dispositif
US10321370B2 (en) * 2012-10-29 2019-06-11 Kyocera Corporation Mobile communication system, user terminal, base station, processor, and communication control method
KR102237199B1 (ko) * 2013-06-28 2021-04-07 삼성전자주식회사 디바이스-투-디바이스 통신 방법 및 장치
US10075940B2 (en) * 2013-08-09 2018-09-11 Kt Corporation Method for transmitting buffer status report in device-to-device communication, and device thereof
CN104811892B (zh) * 2014-01-29 2020-03-13 中兴通讯股份有限公司 一种资源分配方法、装置及系统
ES2702473T3 (es) * 2014-03-21 2019-03-01 Sony Corp Aparato y métodos de telecomunicaciones
US10292191B2 (en) * 2014-03-25 2019-05-14 Futurewei Technologies, Inc. Systems and methods for control plane for D2D communications
KR102183333B1 (ko) * 2014-08-08 2020-11-26 주식회사 아이티엘 단말간 통신을 지원하는 무선 통신 시스템에서 버퍼상태보고 전송 방법 및 장치
JP6273068B2 (ja) * 2014-08-21 2018-01-31 エルジー エレクトロニクス インコーポレイティド 無線ｌａｎにおけるアップリンクデータをトリガする方法及び装置
KR102318019B1 (ko) * 2014-10-17 2021-10-27 삼성전자 주식회사 기기 간(d2d) 통신을 처리하는 방법 및 시스템
KR101692259B1 (ko) * 2016-06-28 2017-01-17 애니파이 주식회사 Wi-Fi 다이렉트 멀티그룹 네트워크 상에서 통신을 위한 방법, 장치 및 컴퓨터 판독 가능한 기록 매체
GB2552200B (en) * 2016-07-13 2021-05-12 Canon Kk Method and apparatus for reporting quantity of data to be transmitted in a wireless network
GB2552192A (en) * 2016-07-13 2018-01-17 Canon Kk Method and apparatus for managing quantity of data to be transmitted in a wireless network

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ABHISHEK PATIL (QUALCOMM): "CIDs in 27.5.2", vol. 802.11ax, no. 2, 5 May 2017 (2017-05-05), pages 1 - 18, XP068115239, Retrieved from the Internet <URL:https://mentor.ieee.org/802.11/dcn/17/11-17-0249-02-00ax-cids-in-27-5-2.docx> [retrieved on 20170505] *
ALFRED ASTERJADHI (QUALCOMM INC): "LB225-MAC-CR-Misc BSR Control", vol. 802.11ax, 10 May 2017 (2017-05-10), pages 1 - 6, XP068115743, Retrieved from the Internet <URL:https://mentor.ieee.org/802.11/dcn/17/11-17-0607-00-00ax-lb225-mac-cr-misc-bsr-control.docx> [retrieved on 20170510] *
PASCAL VIGER (CANON): "Issue of Buffer Status reporting ; 11-16-0856-03-00ax-issue-of-buffer-status-reporting", vol. 802.11ax, no. 3, 26 July 2016 (2016-07-26), pages 1 - 10, XP068107117, Retrieved from the Internet <URL:https://mentor.ieee.org/802.11/dcn/16/11-16-0856-03-00ax-issue-of-buffer-status-reporting.pptx> [retrieved on 20160726] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024525942A (ja) * 2021-07-23 2024-07-12 華為技術有限公司 バッファ報告送信および受信方法ならびに装置

Also Published As

Publication number Publication date
GB2571250A (en) 2019-08-28
GB2571250B (en) 2021-11-03
GB201800772D0 (en) 2018-02-28
US20200374907A1 (en) 2020-11-26

Similar Documents

Publication Publication Date Title
US12238776B2 (en) Trigger frames adapted to packet-based policies in an 802.11 network
US20250240830A1 (en) QoS MANAGEMENT FOR MULTI-USER EDCA TRANSMISSION MODE IN 802.11AX NETWORKS
US20200374907A1 (en) Method and apparatus for reporting quantity of data for direct-link transmission in a wireless network
US12081449B2 (en) QoS management for multi-user and single user EDCA transmission mode in wireless networks
US20180020372A1 (en) Method and apparatus for reporting quantity of data to be transmitted in a wireless network
US10492231B2 (en) Backoff based selection method of channels for data transmission
EP4161205B1 (fr) Équité régénérée dans un réseau 802.11 mettant en oeuvre des unités de ressources
US10966247B2 (en) Queues management for multi-user and single user EDCA transmission mode in wireless networks
US20180020373A1 (en) Method and apparatus for managing quantity of data to be transmitted in a wireless network
US12457640B2 (en) Multi-user random access in a wireless network
GB2581264A (en) QOS management for multi-user EDCA transmission mode in 802.11ax networks
GB2588267A (en) Restored fairness in an 802.11 network implementing resource units

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19700890

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19700890

Country of ref document: EP

Kind code of ref document: A1